class_docstr: Randomly inserts filler words and phrases in the sentence.
  Perturbation example:
  
  **Input:**
      The quick brown fox jumps over the lazy dog.
  
  **Output:**
      The quick brown fox jumps over probably the lazy dog.
code: def perturb(self, text: str, rng: Random) -> str:
      return self.gen_filled_text(
          text,
          self.insert_prob,
          rng,
          self.max_num_insert,
          self.speaker_ph,
          self.uncertain_ph,
          self.fill_ph,
      )
  
file_path: H2O/h2o_hf/helm/src/helm/benchmark/augmentations/filler_words_perturbation.py
imports: from dataclasses import dataclass
  from .perturbation import Perturbation
  from .perturbation_description import PerturbationDescription
  from random import Random
label_desc: Use image node_id 4 for calling the FillerWordsPerturbation obj's underlying member method code with example usage: obj.perturb(text, rng) and returns: self